#!/usr/bin/env bash

wnids=(
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)

wnid="n02814860"

URLS=(
    'https://upload.wikimedia.org/wikipedia/commons/thumb/8/8b/2006_09_06_180_Leuchtturm.jpg/640px-2006_09_06_180_Leuchtturm.jpg'
    'https://upload.wikimedia.org/wikipedia/commons/thumb/5/5b/2014_Leuchtturm_Kap_Arkona_02.jpg/320px-2014_Leuchtturm_Kap_Arkona_02.jpg'
    'https://upload.wikimedia.org/wikipedia/commons/thumb/d/d5/2013-12-06_Orkan_Xaver_in_Warnem%C3%BCnde_12.jpg/640px-2013-12-06_Orkan_Xaver_in_Warnem%C3%BCnde_12.jpg'
    'https://upload.wikimedia.org/wikipedia/commons/thumb/3/37/Leuchtturm_Dornbusch_2012.JPG/321px-Leuchtturm_Dornbusch_2012.JPG'
    'https://upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Neuer_Leuchtturm_Arkona_2012.jpg/640px-Neuer_Leuchtturm_Arkona_2012.jpg'
    'https://upload.wikimedia.org/wikipedia/commons/thumb/7/74/Pilsumer_Leuchtturm_2010-10_CN-I.jpg/640px-Pilsumer_Leuchtturm_2010-10_CN-I.jpg'
    'https://upload.wikimedia.org/wikipedia/commons/thumb/1/13/Lindau_Harbor_Lake_Constance_01.jpg/640px-Lindau_Harbor_Lake_Constance_01.jpg'
    'https://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Heligoland_07-2016_photo28.jpg/640px-Heligoland_07-2016_photo28.jpg'
)

process_file() {
    mime="$(file --brief --mime-type "${1}")"
    ext="$(file --brief --extension "${1}")"
    if [ "${mime%%/*}" == 'image' ] && [ ${ext%%/*} != '???' ]; then
        newfname="${1%/*}/$(md5sum "${1}" | cut -d' ' -f1).${ext%%/*}"
        mv "${1}" "${newfname}"
        return 0
    fi
    rm -f "${1}"
    return 1
}


die() {
    echo >&2 -e "${1-}"
    exit "${2-1}"
}


usage() {
  cat <<EOF
Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-o output] [-w wnid]

Create a ILSVRC2012 image folder with 1000 classes that can be used with PyTorch to 'output'.
Download 8 images of light houses from https://commons.wikimedia.org and put them into folder 'n02814860'.

Requires (magic-) file and cURL.

Available options:

-o, --output    Path to store dataset (default = 'share/datasets/subimagenet')
-h, --help      Print this help and exit
-v, --verbose   Print script debug info
EOF
  exit
}


parse_params() {
    output="share/datasets/lighthouses"

    while :; do
        case "${1-}" in
            -h | --help) usage ;;
            -v | --verbose) set -x ;;
            -o | --output)
                output="${2-}"
                shift
                ;;
            -?*) die "Unknown option: ${1}" ;;
            *) break ;;
        esac
        shift
    done

    [[ -z "${output}" ]] && die "Empty parameter: output"
    [[ ${#args[@]} -ne 0 ]] && die "Too many positional arguments"

    return 0
}


parse_params "$@"

command -v curl >/dev/null || die "curl not available!" 1
command -v file >/dev/null || die "file not available!" 1

mkdir -p "${wnids[@]/#/"$output/"}"

echo -n "Downloading: "
n_loaded=0
for url in "${URLS[@]}"; do
    fname="${output}/${wnid}/image.temp"
    curl "${url}" --silent --location --connect-timeout 3 --max-time 10 --output "${fname}"
    if process_file "$fname"; then
        (( n_loaded++ ))
        echo -ne "\x1b[32m+\x1b[0m"
    else
        echo -ne "\x1b[31m.\x1b[0m"
    fi
done

echo -e "\nDownloaded ${n_loaded} images to '$(readlink -f "${output}")'"
exit 0
